Beautiful shot, I would crop to move the butterfly slightly to the right (so not dead centre), a smaller aperture would have been good (upper wings a little soft), I would tone down the brightest highlights on the flower head too. Otherwise just love it!
The soft ethereal look is working for me. As such, I OOF wings not bothering me. I agree with Jonathan about cropping from right, but would have been better done while composing in camera as you would then have more canvas on the left; composition would have been perfect if about 2/3 of the negative space on right was replaced with equal amount on the left and camera a little lower (subject higher in frame) as you cut the perch a little tight.